let s = Symbol();
let s2 = Symbol();
console.log(s);
let obj = {
        [Symbol()]: function(arg) { //变量
            console.log('-----')
        },
        [Symbol()]: function(arg) {
            console.log('+++++');
        }
    }
    // console.log(obj[s]());
console.log(obj);
Object.getOwnPropertyNames(obj);
Object.getOwnPropertySymbols(obj).forEach(item => {
    // console.log(item);
    obj[item]();
});
// Object.keys();